Orbital Angular Momentum in Radio - A System Study
Mohammadi, S. M. Daldorff, L. K. S. Bergman, J. E. S. Karlsson, R. L. Thide, B. Forozesh, K. Carozzi, T. D. Isham, B.
This paper appears in: Antennas and Propagation, IEEE Transactions on
Accepted for future publication
ISSN: 0018-926X
Abstract
Recent discoveries concerning rotating (helical) phase fronts and orbital angular momentum (OAM) of laser beams are applied to radio frequencies and comprehensive simulations of a radio OAM system are performed. We find that with the use of vector field-sensing electric and magnetic triaxial antennas, it is possible to unambiguously estimate the OAM in radio beams by local measurements at a single point, assuming ideal (noiseless) conditions and that the beam axis is known. Furthermore, we show that conventional antenna pattern optimization methods can be applied to OAM-generating circular arrays to enhance their directivity.
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